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Interesting they specifically cite out different wheels. Which makes me wonder, again, whether my current wheels can take a LT tire w/ the requisite pressure required. Ford is only outfitting F150 HDPP w/ Load Range C tires, most who have upgraded their P tires went straight to E on stock non-HDPP rims.
Answered my own question, AND I'm also talking to myself here:
To the outside observer, the P-metric tire carries more load than the light truck tire with a Load Range C. This may be true as long as the tires are carrying the load for a limited amount of time.
However, LT tires are engineered to operate at maximum load for an indefinite amount of time. In fact, every component of a light truck tire is designed with an extra safety factor to accommodate the increased stress that comes with higher loads and inflation pressures.
According to Cook, the steel belts are heavier, and there are typically stronger radial cords with more cords per inch on a light truck tire when compared to a passenger tire. Finally, the difference in physical weight is often more than 10 pounds between the two, which further illustrates the heavy-duty nature of light truck tires when compared to passenger tires.
In other words, passenger tires are not designed or engineered to operate at the maximum limits.
So even though the P265/75R16 can technically carry more weight than the light truck tire with the lower load index, it is unlikely to operate at maximum capacity for very long.
If the vehicle placard on a pickup truck or SUV calls for Load Range E light truck tires, then the best practice is to use the same Load Range and load index when replacing them. Downgrading to a passenger tire may save a few dollars and give the customer a softer ride, but it creates serious risks if the vehicle is ever loaded to capacity for an extended period of time
Great points. I think the take away here is that the non-LT equivalent tire is 43 pounds. The LT C-load range tire is 50 pounds. The LT E-load range tire is 52 pounds. I would guess that the actual construction of the LT C-load range tires is more similar to the LT E-load range tire than the non-LT based on weight alone.
I've been very impressed with these tires so far. I just got back form Lake Placid NY and traveled both snowy and icy roads on the way home. The tires are decent in snow and ice. Much more than I expected from an OEM tire. I also have not noticed any movement from the tires when towing or hauling so far. They are also quiet given how much tread they have. Unless I have problems with them, I don't se the reason to go up to the "E" rated tires which seem to require more PSI per pound carried (not sure why that would be the case)
Interesting they specifically cite out different wheels. Which makes me wonder, again, whether my current wheels can take a LT tire w/ the requisite pressure required. Ford is only outfitting F150 HDPP w/ Load Range C tires, most who have upgraded their P tires went straight to E on stock non-HDPP rims.
i think most people go straight to E because of the "more is better" mantra. I have frequently went to E myself but that's because that's what was available in the particular tire i wanted in the specific size i wanted... you'll see guys on here to actually go through looking for the lightest tire they can find in the size and style they want and i'm guessing their trucks handle better than mine do with less unsprung weight.
for the rims, i don't think many people think about them as a limiting factor... to be more specific, you'll find threads with people saying "i put airlifter bags on my truck so i can haul more" or "i put e rated tires so i can haul more" and they don't think about how many parts go into their payload considerations... it's also not super easy to shop for rims when you start getting specific... search for a 18x9 rim with 6x135 pattern with 87.1mm hub bore with with -12 offset rated for over 2500 pds. its tough to find a site that has all that information listed so you can compare rims.
I'd be fine w/ a 'C' rated tire, but the pickings are slim in my size w/ really only the Goodyear Adventure w/ Kevlar being the more known tire available. That tire doesn't have the love of the people like the Michelin Defender does.
Regarding frames, I can't find the 1 of the 2 documents as the links are now broken, but the one that's posted at the end of page one can be found by googling "15_F150_SB_Updates_010815.pdf" to find the reference to frame thicknesses, on page 84.
This is the one I'm talking about:
The other one I can't find, but the references go like this;
Any truck, any engine, any model all go by the frame specifications on page 84 of that pdf I mentioned above.
LD is regardless of what engine or trim based on specs if you have neither the payload package or the HDPP package.
HD on the chart is payload packages.
HPP on the chart is with the HDPP package.
Now this all varies as well when you get into longer frames where the default is standard HD, and the payload packages are the HPP...
For example 2.7 SuperCrew 4x4 145 wb falls under LD (0.87" frame thickness) but with payload package it's HD (0.1" frame).
Similarly, a 3.3L, 3.5EB or 5.0 engine in a SuperCrew 4x4 145WB will also have an LD frame unless they have a payload package to bring it to an HD frame.
This is why the chart shows that you can't get the HPP frame on a 145 WB because you can't get the HDPP package unless you have the 157 WB, and why LD and HD are the only options available for 145 WB (no payload package or with payload package)
Last edited by BlackBoost; Jun 22, 2018 at 02:52 PM.
Regarding brakes - I believe all F150's have the same size brakes 13.7"/13.8" rotors - which, by the way, are larger rotors than a year 2000 F350 dually.
Are the brakes fixed caliper with 4-pistons? That's what on have on my Tundra front, but drums rear. Never seen anything on the brakes.
The Defender takes more weight on the tire for less pressure then the Load 'C' Goodyear does.
So what does the 'C' rated tire actually get you?
When looking at "P" and "C or E" rated tires, the weight supported is kind of a funny misleading thing. When towing with either C or E rated tires, you can go with the actual weight listed on the sidewall. With a P rated tire being used on a Truck you actually take the Weight rating and multiply it by 0.909 to get the actual weight carrying capacity.
Have a look at this article, it explains it very well.
The Defender takes more weight on the tire for less pressure then the Load 'C' Goodyear does.
So what does the 'C' rated tire actually get you?
When looking at "P" and "C or E" rated tires, the weight supported is kind of a funny misleading thing. When towing with either C or E rated tires, you can go with the actual weight listed on the sidewall. With a P rated tire being used on a Truck you actually take the Weight rating and multiply it by 0.909 to get the actual weight carrying capacity.
Have a look at this article, it explains it very well.
